Island



UNITED STATES PATENT OFFICE.

AARON B. SIIIPFEE, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO ALBERT V. CHAPMAN, OF SAME PLACE.

ROTARY DIE.

SPECIFICATION forming part of Letters Patent No. 470,215, dated March 8, 1892.

Application filed September 21, 1891. Serial No. 406,313. (No model.)

holding them in place when in use, referring more especially to such dies when used in I rolling twist-drills.

It is fully illustrated in the accompanying drawings.

Figure 1 is a top view of a die in its place in an arbor, a portion of which only is shown. Fig. 2 shows a cross-section of the arbor, taken through on line w as, Fig. 1, showing a side elevation of a die-block and die. Fig. 3 is a longitudinal section of a part of an arbor, dieblock, and die, taken on line 2 .2, Fig. 2. Fig.

' 4 shows an elevation of a part of an arbor having a recess made in it to receive the die or block. Fig. 5 is an end View of a die-block also fitted into the recess in the arbor in Fig. 4. Fig. 6 shows a side elevation of a smaller die fitted to the recess in die-block, Fig. 5. Fig. 7 is an end view of the die shown in Fig. 6.

The rotating dies herein shown and described are intended to take the place of circular-plate dies, which are usually held on an arbor. They have the advantage of being easier to construct in duplicate and much less liable to be damaged by cracking and warping in the process of hardening. They are also much more readily put in place in the machine or taken out and changed without disturbing the other parts of the mechanism. They are held in a recess made in the side of an arbor and are intermittent in action, making an impression at each revolution of the arbor carrying them.

In Fig. 4: a part of an arbor B is seen with a recess a made through one side, leaving a raised portion 0 in the middle, which fits into a recess h on the under side of the die-block g, which fits snugly into the recess a, the object of the raised part 0 being to prevent the sliding of the die-block endwise in the recess.

A the same recesses made for the large ones.

The die-block is held from rising out of the recess in a radial direction by a plate e, (see Fig. 3,) which fits into a recess f, made for it in the arbor, and projects into a recess 0 in the side of the die-block g, which fits into the recess a. A screw 2', that screws into the arbor, passes through the plate 6 and holds it down, so as to prevent the die from rising.

A die-block g is made and is fitted to be held in the recess a, and it has a recess Z made through it (see Fig. 5,) to receive a smaller die 19, of which Fig. 6 shows a side elevation and Fig. 7 an end view. This diep is held in the recess Z by means of two pins r 0", which pass through the sides of the block g and the die 1). On the periphery of this die 19 a small projection s is made to make the required impression.

One advantage of having a smaller body for a small'projection is that when the small projection is made on a large die-body it is very liable to crack and fly in pieces ii? the process of hardening; but when the diebody is small the parts are in better proportion and can be hardened without cracking or warping out of shape; and another advantage is that by means of the block small dies can be used in the same arbor in which large solid dies are used and save the extra labor and stock that would be required if the small dies had to be made large enough to fit in The dies as described may be used in pairs, each die having its separate arbor to operate on opposite sides of a bar, as in rolling the grooves in twist-drills, for which use it is especially adapted or they may be used singly in connection with a traveling table to support the work for other purposes.

Having thus set forth the construction and operation of my improvements, I claim as my invention- In rotary dies, ablock having a recess made in it to hold a die, fitted into a recess in an arbor, in combination with said arbor and die and means, substantially as set forth, for holding the die in the block and the block in 100 the arbor.

A. B. SHIPF EE.

Witnesses:

BENJ. ARNOLD, CHARLES HANNIGAN. 

